authcache 7.x-2.0-alpha4

This is the fourth and likely last alpha release for the authcache module. Since 7.x-2.0-alpha3 the following changes were introduced:

• Authcache Varnish now verifies that a request actually came through a known reverse proxy by looking up $_SERVER['REMOTE_ADDR'] in the variable reverse_proxy_addresses.
• New settings for key lifetime on the Authcache administration page.
• The debug widget now shows more useful information.
• The personalization frontcontroller needed a refactoring because of nonsensical class-dependencies
• Issue #2099419 by milton_segretti: Fix caching for anonymous users when views exposed filter is present
  #2099419: Caching cancelled for anonymous users when exposed filter is present.
• Issue #2099097 by vinmassaro: Fix authcache block admin page
  #2099097: Authcache Block page lists no enabled blocks with PHP notices
• Issue #2104653 by znerol: Authcache debug should display accurate exclude, cancel, preclude reason
  #2104653: Authcache Debug shows wrong no-cache reason after redirect
• Issue #2104661 by znerol: Remove after-POST-preclusion rule
  #2104661: Rethink automatic preclusion after POST-request, this also fixes #2101955: Caching cancelled on search results for logged in users due to redirect?

I plan to focus on documentation and will release one or two betas over the next weeks. Thanks for the contributions and the reported issues, let's keep the ball rolling.

Review the full list of changes between beta3 and beta4 on gitweb.